如何在SQL数据库中使用IdentityUser作为外键的种子？

CREATE TABLE [dbo].[UserRelationships] (
    [Id] INT IDENTITY(1,1) NOT NULL PRIMARY KEY,
    [UserId] NVARCHAR(450) NOT NULL,
    [RelatedUserId] NVARCHAR(450) NOT NULL,
    CONSTRAINT [FK_UserRelationships_Users_UserId] FOREIGN KEY ([UserId]) REFERENCES [dbo].[AspNetUsers] ([Id]),
    CONSTRAINT [FK_UserRelationships_Users_RelatedUserId] FOREIGN KEY ([RelatedUserId]) REFERENCES [dbo].[AspNetUsers] ([Id])
);

var userManager = new UserManager<IdentityUser>(new UserStore<IdentityUser>());

// 获取需要建立关系的用户
var user1 = userManager.FindByName("user1");
var user2 = userManager.FindByName("user2");

// 创建关系
context.UserRelationships.AddOrUpdate(
    new UserRelationship { UserId = user1.Id, RelatedUserId = user2.Id },
    new UserRelationship { UserId = user2.Id, RelatedUserId = user1.Id }
);